The singer posted his first snapshot to his Instagram account (under the handle EltonJohn) on Friday (Dec. 19), two days before he's expected to marry Furnish on Dec. 21. "Please join us this Sunday @DavidFurnish and I will be posting special moments from our big day. #ShareTheLove #EltonJohn #DavidFurnish," he posted on Instagram.

A photo posted by Elton John (@eltonjohn) on Dec 12, 2014 at 4:17pm PST

He later included a photo of the shoes their sons, Zachary and Elijah, will wear to the event, slated to take place in Britain. The caption revealed that their sons will be the ring bearers at the event.